Microcalorimetric study of glucose degradation in some brazilian soils

Critter, Silvana A.M.; Simoni, José de Alencar; Airoldi, Cláudio

doi:10.1016/0040-6031(94)80054-5

Cited by 41 publications

(33 citation statements)

References 14 publications

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“…All experiments, carried out at 28 • C, were performed in ampoules containing 1.0 g of soil and 0.2 mL of aqueous solutions of glucose (5.0 mg) and ammonium sulfate (5.0 mg) in a 1:1 proportion that avoided soil samples submergence and offered ample nutrition for microorganism growth [32]. The thermal effect associated with nutrient degradation was recorded by a computer as a function of time.…”

Section: Experimental Designmentioning

confidence: 99%

Short-time effect of heavy metals upon microbial community activity

Wang

Yao

et al. 2010

Journal of Hazardous Materials

141

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Section: Experimental Designmentioning

confidence: 99%

Short-time effect of heavy metals upon microbial community activity

Wang

Yao

et al. 2010

Journal of Hazardous Materials

141

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“…100 g of soil was determined from the sum of the extractable bases and the total acidity. The total extractable bases of 2.0 meq/100 g of soil were obtained by extracting the percolate fraction of 10.0 g of the soil with 0.10 L of 0.05 M nitric acid solution (Critter et al, 1994). The specific area of 37.3 • 104 cm e g-1 was determined by a BET method.…”

Section: Methodsmentioning

confidence: 99%

Brazilian Red Latosol a Typic Soil as an Exchanger: A Thermodynamic Study Involving Cu, Zn, Cd, Hg, Pb, Ca And Na

Airoldi

Critter

1997

Clays and clay miner.

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Abstract--The thermodynamic cationic exchange process involving divalent (Cu, Zn, Cd, Hg, Pb and Ca) and monovalent (Na) cations in Brazilian red Latosol soil was studied. Using a batchwise method, the exchange was monitored as a function of the added cation concentration and the aqueous suspension of the soil at different temperatures. The isotherm series obtained were adjusted to a modified Langmuir equation, whose results were compared with the proposed Rawat method. The cationic exchange equilibria constants (In K) vary from 1.97 to 9.80 for the Langmuir equation and 7.06 to 13.50 for the Rawat method Hg (13.8 and 22.9), Pb (22.6 and 28.3), Ca (17.0 and 25.9) and Na (9.9 and 19.3) kJ mol ~ at 323 K. These results suggest that the interaction occurs by complex formation between the organic matter of the soil matrix and the cations dispersed in aqueous solution.

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“…Next, 1.2 g of sediment sample was amended with 0.20 mL of a solution containing 5.0 mg glucose and 5.0 mg ammonium sulfate. Glucose and ammonium sulfate were added to stimulate sediment microbial activity and provide nitrogen and sulfur for microorganisms to synthesize amino acids (Critter et al 1994). This can avoid problems relating to accumulation of CO 2 and fluxes of heat from evaporation processes inside the ampoule (Nuñez et al 1994b; Barja and Núñez 1999).…”

Section: Microcalorimetric Measurementmentioning

confidence: 99%

Characterization of Depth-Related Microbial Community Activities in Freshwater Sediment by Combined Method

Chen

Yao

et al. 2011

Geomicrobiology Journal

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Currently there are very few researches on studying the vertical changes of metabolic and thermodynamic properties of microbial communities in freshwater lake sediment. In this work, a multi-channel microcalorimetric system was applied to investigate both the metabolism and thermodynamic properties of 0-35 cm sediment cores from Lake Honghu (Jingzhou, Hubei Province, China). It is suggested that the catastrophic flood in 1998 had changed the structure of the 20-25 cm sediment layer. In this layer, both the physicochemical properties of sediment and the thermodynamic activities of microorganisms exhibit distinct differences from other layers. It displays the highest TOC, TN and C/N values. The power-time curves of microcalorimetric measurement on the sediment samples were plotted to illustrate their microbial activities. The 20-25 cm sediment layer showed the lowest microbial activities with a maximum heat flow rate of 56.97 µW, a growth rate constant of 0.06 h −1 and the time to reach the peak was 98 h. A positive correlation (r = 0.972, P < 0.001) was found between the cell specific metabolic enthalpy change rate ( H 0 ) and the TOC of the sediment samples. H 0 could indicate the utilization efficiency of carbon source which is not affected by the biomass but relies on the intrinsic properties of sediment. Our work shows that the higher the TOC in sediment; the lower the efficiency in assimilating carbon into biomass by the microbes.

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Microcalorimetric study of glucose degradation in some brazilian soils

Cited by 41 publications

References 14 publications

Short-time effect of heavy metals upon microbial community activity

Short-time effect of heavy metals upon microbial community activity

Brazilian Red Latosol a Typic Soil as an Exchanger: A Thermodynamic Study Involving Cu, Zn, Cd, Hg, Pb, Ca And Na

Characterization of Depth-Related Microbial Community Activities in Freshwater Sediment by Combined Method

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